What do yall think of royal purple oil all kinds of oil docent matter which one exactly?

 

Personally, I think RP is junk.

All tests I have seen RP was one of the worst synthetics, it didn't hold it's viscosity at all. Ok for short life.... but the longer you use it the thinner it got.

 

il take ur word, so whats the best for say diff's

 

i like valvoline or mobil 1......

 

I'm a Valvoline fan myself. Diff fluid can be had for $12/qt. almost anywhere also.

 

I was looking into the Royal Purple Synchromax to put in my 6 speed. Maybe I won't though. I have a friend who swears by Amsoil, and he can get me a pretty good deal through his business. So maybe I will stay away from the RP and go with Amsoil.

O BTW I put Mobil 1 synthetic in my rear diff and so far so good, I think I paid like 14 a qt though.

Dennis

 

dont use a manual trans fluid in a zf6
hard to believe but it takes ATF

 

Ya I read that it takes the Auto Tranny Fluid. The RP web site said that the fluid is designed specifically for manual trannys that are designed to take ATF. Thats why it caught my mind.

Any other recommendations for fluid in the zf6?

Thanks
Dennis

 

My friend has a water well service uses his trucks to haul and tow loads constantly. Everything that had the RP in the diffs have had failures and the oil turned into a black stinky mess. I have the Mobil syn in my diff and trans. Soon to be in transfer case also.

 

Amsoil, and Scheaffer's that's what i use, you won't be disappointed.

 

I've had RP in my diff for 50K and it still looks nice and purple. Course I don't tow much. only about 30,000 miles a year! I also have it in my tranny and t/case. I've had good luck with it.
as always, your mileage may vary!

Barney

 

Mobil 1 Syn ATF gets my vote. I had some smuggled across state lines recently since you can't find it in CA very easily.

 

Ran it in my harley, once. Changed out the dino for synthetic burple. 250 miles later, lost the rear cylinder due to overheating. Back to running Penzoil 50 weight and no issues.
Not going in my truck. Just sayin.

 

Schaeffer"s here!!

 

Back to the O/P:

I like Mobil-1 75W-140 in both the front and rear differentials. Good stuff, and available most everywhere.

Also, I did not need to add any friction modifier to get the rear clutches to perform correctly, but YMMV.

If you have a SRW, synthetic is an absolute MUST! You might be surprised at what the temperatures get up to in there.

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